This particular approach to modifying the chart UI wpf is not documented and was thus was not directly mentioned in the release notes.
While a note was added to the release notes that the chart trader area was updated to now be resizable (13132), there wasn't any mention of what changes were applied in the core code to achieve this or that this was a code breaking change as it was never documented.
Even with documented code, the NinjaTrader Development team does have to change the inner workings of the code to correct bugs and implement new features. Some of those changes may be code breaking changes. The majority of drastic code breaking changes have in the past been reserved for major new version numbers and this will likely continue to be the trend. However, small code breaking changes can still occur.
As a side note, this also caused issues with some of the examples I have personally made and uploaded to the forums and I am also having to re-code these. In particular the ChartCustomSidePanelExample_NT8 indicator that adds a panel right where the gridsplitter just got added.
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